Jack for repair-shops.



G. W. POND.

JACK FOR REPAIR SHOPS.

APPLICATION FILED APR. 9, 1909.

946,067, Patented Jan. 11, 1910.

2 SHEETS-SHEET 1.

G. W. POND.

JACK FOR REPAIR SHOPS.

APPLICATION FILED APR. 9, 1909.

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ENE i Flt? GEORGE W. POND, OF EAU CLAIRE, WISCONSIN.

JACK FOR REPAIR-SHOPS.

Specification of Letters Patent.

Patented Jan. 11, 1910.

To all whom it may concern:

Be it known that I, GEORGE 1V. POND, a citizen of the United States, residing at Eau Claire, in the county of Eau Claire and State of \Visconsin, have invented certain new and useful Improvements in Jacks for Repair Shops, of which the following is a specification.

This invention relates to apparatus or appliances for machines or repair shops, and especially to a supporting jack to be used for the repairing, inspection, or testing of sewing machines or other similar or high speed machines.

The invention comprises certain specific novel features of construction hereinafter fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of the invention showing in diagram a sewing machine head attached thereto; Fig. 2 is a vertical transverse section showing the jack attached to a bench; Fig. 3 is a perspective View of the same in a different position from that indicated in Fig. 1, and Fig. 1 is a detail showing the manner of connecting the testing wheel to the base of the jack. Throughout the following detail description and on the several figures of the drawings similar parts are referred to by like reference characters.

The invention comprises a frame 10 of rigid character and having a plurality of supporting legs 11 adapted to rest upon the top of a work bench or table 12. The body of the frame 10 is substantially horizontal and is provided centrally with a vertical hub 13, which extends downwardly preferably close to the surface of the bench. At the upper end of the hub is a cup 14; receiving a series of anti-friction balls, and upon which is held a cone 15. A suitable bolt or wood screw 16 is passed through the cone and hub into a hole in the top of the bench. By this means the frame 10 may be caused to be clamped to the bench with any desired degree of friction, either to bind the legs 11 firmly to the bench or with just enough friction to enable the workman to swing the frame 10 around the screw 16 as a pivot in order to vary the position or angle of the jack during his operations therewith. The provision of the anti-friction bearing for this pivot is essential in that the pivotal movement of the frame just described will thereby not tend to vary the adjustment of the screw. The cone 15 is prevented from accidental displacement from the bearing even though the screw 16 be removed, by means of adjustable screws 17.

At any suitable point preferably at the right side of the frame is provided a socket 18 in which may be clamped, by a set screw 19, a short stub shaft 20 upon which is journaled a testing or speed wheel 21, the same being secured thereon in place as by an adjustable collar 22. The shaft 20 is adjustable longitudinally in its socket 18 in order to accommodate the operation on different lengths or sizes of machines to be carried by the jack.

At the rear portion of the frame 10 are upwardly projecting lugs 23 constituting pivot supports for a yoke 24 pivoted thereto by means of a bolt 25, which extends through said lugs 23 and holes in said yoke. The yoke is provided preferably centrally with a sleeve 26 and projecting horizontally when in normal position through said sleeve from front to rear is an arm 27. The rear end of the arm is screw threaded at 27 and a binding nut 28 cooperates therewith and against the rear end of the sleeve 26. The front end of the arm is extended downwardly forming a foot 29 whose lower end rests upon a rib 30 preferably integral with the frame 10. The rear edge of the foot extension 29 is provided with a hook 31 in substantially the same plane with other hooks 32 formed on the yoke 24. By this arrangement the base plate of a sewing machine head, may be securely clamped to the yoke 24, the hooks mentioned being preferably just far enough below the under surface of the arm 27 to provide sufficient space on the upper surface of the base plate of the machine head to operate thereupon, as for finishing or varnishing. hen in this position the machine thus clamped to the yoke may be elevated to the position indicated in dotted lines in Fig. 2, at which time the mechanism on the under surface of the machine head base may be operated upon.

The arm 27 may be provided with a handhold 33 and extension 3& as a convenient means for moving the machine. The same may also be provided with a hook 34: whereby the same may be clamped down upon the frame 10 by the application of a wire loop or the like indicated at 3 1. This means for clamping the arm 27 down upon the frame is availed of during the running or testing of high speed machines to prevent I undesirable vibration. hen the machine and yoke are lifted as above indicated extensions 35 of the yoke will engage fixed stops 36 of the frame whereby such upward I and rearward swinging movement will be I determined and whereby the machine will be held in the proper elevated position.

The frame 10 may be provided atany suitable point with an additional socket 18 for the application of a larger or different type of testing wheel, whereby different types of machines may be operated in a suitable manner or at a higher speed by the application of a set of speed gears to be connected up with the aforesaid testing wheel 21.

In applying a sewing machine head to this supporting jack the arm 27 will be slightly elevated and the forward end therei of passed through the space between thel head proper and its base and the forward edge of the said base will engage the hook 31. The arm and head will then be pushed rearwardly causing the rear edge of the machine head base to be engaged by the hooks 32. The nut 28 will then be firmly tightened, clamping the machine in place. The distance between the hooks 32 will be ample for the purpose of securely holding the machine for operations and yet allow sufficient space at the needle end of the machine head for operation upon the shuttle mechanism.

The jack mechanism it will be understood may be made of any suitable materials or dimensions. As indicated in the drawings a machine of suitable size may be made to accommodate practically all of the various types of domestic sewing machines and many other high speed machines.

Having thus described the invention, what I is claimed as new is: l 1. In a machine of the character set forth, the combination of a base frame having supporting legs and upwardly projecting lugs,

means to secure the frame in place, a yoke pivoted on a horizontal pivot between said lugs, an arm adjustably carried by said yoke and having an extension to rest upon said frame, and means associated with the said yoke and arm to engage and support a machine thereupon.

2. In a device of the character set forth, the combination of a frame having supporting legs, means to clamp the frame to a bench, a yoke pivotally connected to the frame and having a sleeve, an arm adjustably mounted in said sleeve and having a projection normally resting upon the frame, means associated with the arm and yoke to support a machine thereon, means whereby the arm may be lifted, and means to limit the upward movement thereof.

3. In a device of the character set forth, the combination of a frame, means to secure the same in place, a testing wheel, a journal support for the wheel, means to adjustably secure said support to the frame, and means connected to the frame to clamp and support a machine thereupon to be operated upon from said wheel.

t. In a device of the character set forth, the combination of a frame, means includ ing an anti-friction bearing for clamping said frame to a bench, a yoke, a horizontal pivot connecting said yoke to the frame, said yoke having a sleeve, an arm adapted to extend through said sleeve in substantially parallel relation to the frame, said arm being provided with a downward extension, a rearwardly extending hook, and a handhold, means associated with the yoke and cooperating with said hook to support a machine thereon, and means to limit the pivotal movement of said yoke and arm.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE POND.

Witnesses RUTH ANDERSON, J. F. ELLIS. 

